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> Windows > Drawing in child window. |
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bitRAKE 06 Feb 2009, 02:39
Subclass the STATIC and grab its WM_PAINT messages. I like to use WM_ERASEBKGND if the image is the background - no sense in Windows painting a background and then overwriting it - not to mention the fact windows provides hDC, so (BEGIN/END)PAINT aren't needed.
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06 Feb 2009, 02:39 |
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barmentalisk 09 Feb 2009, 10:47
bitRAKE, thanks for idea of subclassing! Check, please, if I did it right, - here working code which I get:
Code: format PE GUI 4.0 entry start include 'win32a.inc' HTCAPTION = 2 section '.data' data readable writeable _class TCHAR 'FASMWIN32',0 sclass TCHAR 'STATIC',0 _title TCHAR 'Drawing in child window',0 _error TCHAR 'error',0 wc WNDCLASS 0,WindowProc,0,0,NULL,NULL,NULL,COLOR_BTNFACE,NULL,_class msg MSG ps PAINTSTRUCT rect RECT OldWndproc dd ? hstatic dd ? hBitmap dd ? hdc dd ? hMemDC dd ? section '.code' code readable executable start: invoke GetModuleHandle,0 mov [wc.hInstance],eax invoke LoadIcon,0,IDC_ICON mov [wc.hIcon],eax invoke LoadCursor,0,IDC_ARROW mov [wc.hCursor],eax invoke RegisterClass,wc test eax,eax jz error invoke CreateWindowEx,0,_class,_title,WS_VISIBLE+WS_DLGFRAME+WS_SYSMENU,128,128,526,471,NULL,NULL,[wc.hInstance],NULL test eax,eax jz error msg_loop: invoke GetMessage,msg,NULL,0,0 cmp eax,1 jb end_loop jne msg_loop invoke TranslateMessage,msg invoke DispatchMessage,msg jmp msg_loop error: invoke MessageBox,NULL,_error,NULL,MB_ICONERROR+MB_OK end_loop: invoke ExitProcess,[msg.wParam] proc WindowProc hwnd,wmsg,wparam,lparam push ebx esi edi mov eax,[wmsg] cmp eax,WM_CREATE je .wmcreate cmp eax,WM_PAINT je .wmpaint cmp eax,WM_DESTROY je .wmdestroy cmp eax,WM_LBUTTONDOWN je .wmlbuttondown .defwndproc: invoke DefWindowProc,[hwnd],[wmsg],[wparam],[lparam] jmp .finish .wmcreate: invoke LoadBitmap,[wc.hInstance],37 mov [hBitmap],eax invoke CreateWindowEx,0,sclass,0,WS_VISIBLE+WS_CHILD+WS_DLGFRAME,128,128,320,240,[hwnd],NULL,[wc.hInstance],NULL mov [hstatic],eax ;subclassing invoke SetWindowLong,eax,GWL_WNDPROC,StatWndproc mov [OldWndproc],eax jmp .finish .wmpaint: invoke BeginPaint,[hwnd],ps mov [hdc],eax invoke CreateCompatibleDC,[hdc] mov [hMemDC],eax invoke SelectObject,[hMemDC],[hBitmap] invoke GetClientRect,[hwnd],rect invoke BitBlt,[hdc],0,0,[rect.right],[rect.bottom],[hMemDC],0,0,SRCCOPY invoke DeleteDC,[hMemDC] invoke EndPaint,[hwnd],ps jmp .finish .wmlbuttondown: invoke ReleaseCapture invoke SendMessage,[hwnd],WM_NCLBUTTONDOWN,HTCAPTION,0 jmp .finish .wmdestroy: invoke PostQuitMessage,0 xor eax,eax .finish: pop edi esi ebx ret endp ;paint static window proc StatWndproc hwnd,wmsg,wparam,lparam push ebx esi edi cmp [wmsg],WM_PAINT jne .finish invoke BeginPaint,[hwnd],ps mov [hdc],eax invoke CreateCompatibleDC,[hdc] mov [hMemDC],eax invoke SelectObject,[hMemDC],[hBitmap] invoke GetClientRect,[hwnd],rect invoke BitBlt,[hdc],0,0,[rect.right],[rect.bottom],[hMemDC],0,0,SRCCOPY invoke DeleteDC,[hMemDC] invoke EndPaint,[hwnd],ps .finish: invoke CallWindowProc,[OldWndproc],[hwnd],[wmsg],[wparam],[lparam] pop edi esi ebx ret endp section '.idata' import data readable writeable library gdi32,'GDI32.DLL',\ kernel32,'KERNEL32.DLL',\ user32,'USER32.DLL' include 'api\gdi32.inc' include 'api\kernel32.inc' include 'api\user32.inc' section '.rsrc' resource data readable directory RT_BITMAP,bitmaps resource bitmaps,\ 37,LANG_NEUTRAL,pict bitmap pict,'bitmap.bmp' But I didnot understand anything else, what you wrote. I even didnot understand should I sent or get WM_ERASEBKGND message =). Could you describe this better, or put some short example? |
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09 Feb 2009, 10:47 |
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bitRAKE 09 Feb 2009, 11:45
Essentially, the difference is:
Code: .wmerasebkgnd: invoke CreateCompatibleDC,[wparam] mov [hMemDC],eax invoke SelectObject,[hMemDC],[hBitmap] invoke GetClientRect,[hwnd],rect invoke BitBlt,[wparam],0,0,[rect.right],[rect.bottom],[hMemDC],0,0,SRCCOPY invoke DeleteDC,[hMemDC] mov eax,1 ; background updated jmp .finish ...verses: Code: .wmpaint: invoke BeginPaint,[hwnd],ps mov [hdc],eax invoke CreateCompatibleDC,[hdc] mov [hMemDC],eax invoke SelectObject,[hMemDC],[hBitmap] invoke GetClientRect,[hwnd],rect invoke BitBlt,[hdc],0,0,[rect.right],[rect.bottom],[hMemDC],0,0,SRCCOPY invoke DeleteDC,[hMemDC] invoke EndPaint,[hwnd],ps jmp .finish 1) process without calling OldWndproc 2) process and then call OldWndproc 3) call OldWndproc and then change result When sub-classing it's important to choose the approach which is appropriate (or a combination of 2 and 3). I have an example posted: http://board.flatassembler.net/topic.php?t=7983 This works, too: Code: _37 TCHAR '#37',0 ... invoke CreateWindowEx,0,sclass,_37,WS_VISIBLE+WS_CHILD+SS_BITMAP,128,128,0,0,[hwnd],0,[wc.hInstance],0  |
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09 Feb 2009, 11:45 |
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barmentalisk 09 Feb 2009, 14:08
Aha, I catch the idea. You tell about the way to paint window faster, but only if it is the main window and only if the bitmap is background.
Thanks for this, it is rather usefull ! And about sub-classing message handling you mean that, after painting in my proc, there is no reason to call default system procedure? |
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09 Feb 2009, 14:08 |
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bitRAKE 09 Feb 2009, 19:24
barmentalisk wrote: And about sub-classing message handling you mean that, after painting in my proc, there is no reason to call default system procedure? _________________ ¯\(°_o)/¯ “languages are not safe - uses can be” Bjarne Stroustrup |
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09 Feb 2009, 19:24 |
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